Support for the Arduino IDE 1.0 + (OSX/Windows/Linux).
Power via USB or External Source or 7-16 v to 5 v (automatic selection).
The Onboard, 150 ma 5 v Regulator.
Built-in USB and serial were debugging).
6 I/O Pins (2 inform the for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB).